multidimensional array difference php

Question

I have two multidimensional arrays and I want the difference. For eg. I have taken two-dimensional two arrays below

$array1 = Array (
       [a1] => Array         


        

Answer 1

Try the function:

 1, 'white' => ['purple' => 4, 'green' => 3], 'red' => 2];
$filter = ['blue' => 6, 'white' => ['yellow' => 7, 'green' => 5], 'red' => 2];

/**
 * @param array $input
 * @param array $filter
 * @return array
 */
function multidimensionalArrayDiffKey(array $input, array $filter)
{
    if ($diff = array_diff_key($input, $filter)){
        return $diff;
    }else{
        foreach($input as $key => $value){
            if(is_array($value) && $diff = multidimensionalArrayDiffKey($value, $filter[$key])){
                return [$key => $diff];
            }
        }
    }
    return [];
}
print_r(multidimensionalArrayDiffKey($input, $filter));

Result:

Array
(
    [white] => Array
        (
            [purple] => 4
        )

)